A) 3.3 kW
B) 0.33 kW
C) 0.033 kW
D) 33 kW
Correct Answer: A
Solution :
Key Idea Power is the rate at which a force does work. Efficiency of engine, \[\eta =60%\] Thus, power \[=\frac{work/times}{\eta }=\frac{100}{60}\times \frac{mgh}{l}\] Given, \[m=100\,kg,\,h=10\,m,\,\,t=5\,s\] and\[g=10\,\,m{{s}^{-2}}\]. Hence, power \[\frac{100}{60}\times \frac{100\times 10\times 10}{5}\] \[=3.3\times {{10}^{3}}W\] = 3.3 kW
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